annotate MoinMoin/events/__init__.py @ 2064:5cc8f6714297

Add more event types. Return a list of messages generated by event handlers to caller.
author Karol 'grzywacz' Nowak <grzywacz@sul.uni.lodz.pl>
date Thu, 31 May 2007 01:00:27 +0200
parents 7547652ffb6f
children afa784d8d58d
rev   line source
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1 # -*- coding: iso-8859-1 -*-
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2 """
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3 MoinMoin - event (notification) framework
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4
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5 This code abstracts event handling in MoinMoin,
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6 currently for notifications. It implements the observer pattern.
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7
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8 @copyright: 2007 by Karol Nowak <grywacz@gmail.com>
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9 @license: GNU GPL, see COPYING for details.
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10 """
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11
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12 from MoinMoin import wikiutil
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13 from MoinMoin.util import pysupport
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14
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15 # A list of available event handlers
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16 event_handlers = None
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17
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18 # Create a list of extension actions from the package directory
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19 modules = pysupport.getPackageModules(__file__)
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20
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21 class Observable:
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22 """A class handling information common to all events."""
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23
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24 def __init__(self, request):
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25 self.request = request
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26
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27 class PageEvent(Observable):
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28 """An event related to a page change"""
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29
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30 class PageChangedEvent(PageEvent):
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31 def __init__(self, request, page, comment, trivial):
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32 Observable.__init__(self, request)
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33 self.page = page
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34 self.comment = comment
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35 self.trivial = trivial
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36
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37 class PageRenamedEvent(PageEvent):
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38 pass
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39 class PageDeletedEvent(PageEvent):
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40 pass
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41 class FileAttachedEvent(PageEvent):
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42 pass
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43
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44 class PageRevertedEvent(PageEvent):
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45 def __init__(self, request, pagename, previous, current):
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46 Observable.__init__(self, request)
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47 self.pagename = pagename
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48 self.previous = previous
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49 self.current = current
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50
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51 class SubscribedToPageEvent(PageEvent):
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52 def __init__(self, request, pagename, username):
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53 Observable.__init__(self, request)
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54 self.pagename = pagename
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55 self.username = username
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56
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57 def register_handlers(cfg):
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58 """Create a list of available event handlers.
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59
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60 Each handler is a handle() function defined in an plugin,
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61 pretty much like in case of actions.
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62
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63 TODO: maybe make it less dumb? ;-)"""
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65 global event_handlers
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67 event_handlers = []
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68 names = wikiutil.getPlugins("events", cfg)
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70 for name in names:
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71 handler = wikiutil.importPlugin(cfg, "events", name, "handle")
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73 if handler is not None:
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74 event_handlers.append(handler)
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76 def send_event(event):
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77 """Function called from outside to process an event"""
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79 # A list of messages generated by event handlers, passed back to caller
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80 msg = []
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82 # Find all available event handlers
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83 if event_handlers is None:
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84 register_handlers(event.request.cfg)
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86 # Try to handle the event with each available handler (for now)
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87 for handle in event_handlers:
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88 retval = handle(event)
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89 if isinstance(retval, unicode):
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90 msg.append(retval)
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91
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92 return msg